
Why do I feel like I understand it as the ryou who went back was not actually the ryou of the present but him in his past life. That he got reincarnated as son ryou, and the time slip thing was to kind of like seeing the connection of his past life and the man who he calls father, and there starts the complicated relationship of a father and son....
Or maybe it's just me wanting a plot twist that they're really not related
wait, pls him remember his past with him